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Segment Information
 9 Months Ended
Sep. 27, 2025
Segment Reporting [Abstract]  
Segment Information Segment Information
Each of the Company’s reportable segments is composed of certain operating segments that are aggregated primarily by the nature of products offered as follows:

Piping Systems

Piping Systems is composed of the following operating segments: Domestic Piping Systems Group, Great Lakes Copper, European Operations, Trading Group, Jungwoo-Mueller (the Company’s South Korean joint venture), and Mueller Middle East (the Company’s Bahraini joint venture).  The Domestic Piping Systems Group manufactures and distributes copper tube, fittings, and line sets.  These products are manufactured in the U.S., sold in the U.S., and exported to markets worldwide.  Outside the U.S., Great Lakes Copper manufactures copper tube and line sets in Canada and sells the products primarily in the U.S. and Canada. European Operations manufactures copper tube in the U.K. which is sold primarily in Europe.  The Trading Group manufactures pipe nipples and resells brass and plastic plumbing valves, malleable iron fittings, faucets, and plumbing specialty products in the U.S. and Mexico.  Jungwoo-Mueller manufactures copper-based joining products that are sold worldwide.  Mueller Middle East manufactures copper tube and serves markets in the Middle East and Northern Africa. The Piping Systems segment’s products are sold primarily to plumbing, refrigeration, and air-conditioning wholesalers, hardware wholesalers and co-ops, building product retailers, and air-conditioning original equipment manufacturers (OEMs).

Industrial Metals

Industrial Metals is composed of the following operating segments: Brass Rod, Impacts & Micro Gauge, Brass Value-Added Products, Precision Tube, and Nehring.  These businesses manufacture brass rod, impact extrusions, forgings, specialty copper, copper alloy, and aluminum tube, as well as a wide variety of end products including plumbing brass, automotive components, valves, fittings, gas assemblies, and high-quality wire and cable solutions.  These products are manufactured in the U.S. and sold primarily to OEMs and utilities in the U.S., many of which are in the industrial, transportation, construction, heating, ventilation, and air-conditioning, plumbing, refrigeration, energy, telecommunication, and electrical transmission and distribution markets.

Climate

Climate is composed of the following operating segments: Refrigeration Products, Westermeyer, Turbotec, Flex Duct, and Linesets, Inc. The segment manufactures and sells refrigeration valves and fittings, high pressure components, coaxial heat exchangers, insulated HVAC flexible duct systems, and line sets primarily for the heating, ventilation, air-conditioning, and refrigeration markets in the U.S.

The Company’s chief operating decision maker (CODM) is the chief executive officer. Performance of segments is generally evaluated by their operating income.  Summarized product line and segment information is shown in the following tables. Unallocated expenses include general corporate expenses, plus certain charges or credits not included in segment activity. 
The following tables represent a disaggregation of revenue from contracts with customers, along with the reportable segment for each category:

For the Quarter Ended September 27, 2025
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$591,206 $— $— $591,206 
Brass rod, forgings, wire and cable— 215,017 — 215,017 
OEM components, tube and assemblies— 20,236 33,237 53,473 
Valves and plumbing specialties127,198 — — 127,198 
Flex duct and other HVAC components— — 93,428 93,428 
Other— 13,686 — 13,686 
 718,404 248,939 126,665 1,094,008 
Intersegment sales(16,184)
Net sales$1,077,824 

For the Quarter Ended September 28, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$541,568 $— $— $541,568 
Brass rod, forgings, wire and cable— 209,257 — 209,257 
OEM components, tube and assemblies— 17,775 30,169 47,944 
Valves and plumbing specialties112,316 — — 112,316 
Flex duct and other HVAC components— — 98,313 98,313 
Other— 10,982 — 10,982 
 653,884 238,014 128,482 1,020,380 
Intersegment sales(22,549)
Net sales$997,831 
Disaggregation of revenue from contracts with customers (continued):

For the Nine Months Ended September 27, 2025
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$1,732,354 $— $— $1,732,354 
Brass rod, forgings, wire and cable— 668,054 — 668,054 
OEM components, tube & assemblies— 59,174 101,878 161,052 
Valves and plumbing specialties369,208 — — 369,208 
Flex duct and other HVAC components— — 285,409 285,409 
Other— 44,222 — 44,222 
 2,101,562 771,450 387,287 3,260,299 
Intersegment sales(44,137)
Net sales$3,216,162 

For the Nine Months Ended September 28, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
Tube and fittings$1,588,893 $— $— $1,588,893 
Brass rod, forgings, wire and cable— 495,612 — 495,612 
OEM components, tube & assemblies— 57,150 90,755 147,905 
Valves and plumbing specialties343,628 — — 343,628 
Flex duct and other HVAC components— — 285,069 285,069 
Other— 36,660 — 36,660 
1,932,521 589,422 375,824 2,897,767 
Intersegment sales(52,537)
Net sales$2,845,230 
Summarized segment information is as follows:

For the Quarter Ended September 27, 2025
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
External net sales$709,669 $241,857 $126,298 $1,077,824 
Internal net sales8,735 7,082 367 16,184 
718,404 248,939 126,665 1,094,008 
Reconciliation of net sales:
Elimination of intersegment net sales(16,184)
Total net sales1,077,824 
Less: (1)
Manufacturing costs (2)
473,936 208,456 80,475 762,867 
Sales and marketing expense6,683 1,619 3,394 11,696 
Distribution expense11,017 472 526 12,015 
Other segment items (3)
10,609 7,464 3,370 21,443 
Segment operating income216,159 30,928 38,900 285,987 
Reconciliation of segment operating income:
Corporate expenses(9,872)
Interest expense(6)
Interest income10,822 
Unrealized losses on short-term investments(2,277)
Pension plan termination expense(4,830)
Other income, net627 
Income before income taxes$280,451 
(1) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM. Intersegment expenses are included within the amounts shown.
(2) Manufacturing costs include material, manufacturing conversion costs, and freight.
(3) Other segment items include administrative employee compensation expense, professional fees, foreign currency exchange gains/losses, other overhead costs, and other items such as gains/losses on sale of assets, impairment charges, and gains on insurance proceeds (as applicable).
Segment information (continued):

For the Quarter Ended September 28, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
External net sales$635,183 $234,366 $128,282 $997,831 
Internal net sales18,701 3,648 200 22,549 
653,884 238,014 128,482 1,020,380 
Reconciliation of net sales:
Elimination of intersegment net sales(22,549)
Total net sales997,831 
Less: (1)
Manufacturing costs (2)
463,926 208,227 83,018 755,171 
Sales and marketing expense7,390 1,044 3,555 11,989 
Distribution expense9,744 564 545 10,853 
Other segment items (3)
9,223 3,982 596 13,801 
Segment operating income163,601 24,197 40,768 228,566 
Reconciliation of segment operating income:
Corporate expenses(21,866)
Interest expense(113)
Interest income11,145 
Realized and unrealized gains on short-term investments164 
Other expense, net(122)
Income before income taxes$217,774 
Segment information (continued):

For the Nine Months Ended September 27, 2025
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
External net sales$2,074,222 $755,455 $386,485 $3,216,162 
Internal net sales27,340 15,995 802 44,137 
2,101,562 771,450 387,287 3,260,299 
Reconciliation of net sales:
Elimination of intersegment net sales(44,137)
Total net sales3,216,162 
Less:
Manufacturing costs1,431,571 650,255 246,438 2,328,264 
Sales and marketing expense22,990 4,179 10,364 37,533 
Distribution expense33,541 1,918 1,548 37,007 
Other segment items(11,159)23,476 11,785 24,102 
Segment operating income624,619 91,622 117,152 833,393 
Reconciliation of segment operating income:
Corporate expenses(46,848)
Interest expense(48)
Interest income28,945 
Unrealized gains on short-term investments5,925 
Pension plan termination expense(4,830)
Other expense, net(423)
Income before income taxes$816,114 
Segment information (continued):

For the Nine Months Ended September 28, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateTotal
External net sales$1,891,732 $578,389 $375,109 $2,845,230 
Internal net sales40,789 11,033 715 52,537 
1,932,521 589,422 375,824 2,897,767 
Reconciliation of net sales:
Elimination of intersegment net sales(52,537)
Total net sales2,845,230 
Less:
Manufacturing costs1,393,226 498,084 243,718 2,135,028 
Sales and marketing expense20,316 2,565 10,637 33,518 
Distribution expense28,740 1,719 1,519 31,978 
Other segment items21,700 8,893 7,614 38,207 
Segment operating income468,539 78,161 112,336 659,036 
Reconciliation of segment operating income:
Corporate expenses(58,905)
Interest expense(335)
Interest income42,773 
Realized and unrealized gains on short-term investments529 
Other expense, net(848)
Income before income taxes$642,250 
Other segment disclosures:

For the Quarter Ended September 27, 2025
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and UnallocatedTotal
Depreciation and amortization (4)
$5,531 $8,346 $1,657 $1,073 $16,607 
Loss (gain) on disposal on sale of assets, net13 — — (11,865)(11,852)
Asset impairments2,018 — — — 2,018 
Gain on insurance proceeds(4,869)— — — (4,869)
Expenditures for long-lived assets (including those resulting from business acquisitions)5,387 9,486 3,418 — 18,291 
Segment assets1,272,584 871,514 279,101 1,273,124 3,696,323 
(4) The amount of depreciation and amortization disclosed by reportable segment is included within the other segment expense captions, such as manufacturing costs or other segment items.

For the Quarter Ended September 28, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and UnallocatedTotal
Depreciation and amortization (4)
$5,082 $3,976 $1,650 $1,002 $11,710 
Gain on sale of assets, net— — (2,667)— (2,667)
Expenditures for long-lived assets (including those resulting from business acquisitions)3,739 13,917 2,034 6,465 26,155 
Segment assets1,139,615 811,792 268,534 986,191 3,206,132 

For the Nine Months Ended September 27, 2025
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and UnallocatedTotal
Depreciation and amortization$17,021 $25,148 $5,075 $4,391 $51,635 
(Gain) loss on disposal of assets, net(15,796)(3)1,010 (11,865)$(26,654)
Asset impairments2,018 — — — 2,018 
Gain on insurance proceeds(41,147)— — — (41,147)
Expenditures for long-lived assets (including those resulting from business acquisitions)17,410 25,717 5,855 — 48,982 

For the Nine Months Ended September 28, 2024
(In thousands)Piping SystemsIndustrial MetalsClimateCorporate and UnallocatedTotal
Depreciation and amortization$14,574 $8,264 $4,891 $3,168 $30,897 
Loss (gain) on sale of assets, net281 — (2,667)(1,567)(3,953)
Expenditures for long-lived assets (including those resulting from business acquisitions)14,321 117,806 6,798 11,652 150,577